SUNMONTUEWEDTHUFRISAT
Conferences, Lectures, & Seminars
Events for August
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Graph Laplacian Regularizer for Inverse Imaging Problems
Tue, Aug 12, 2014 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Prof. Gene Cheung, National Institute of Informatics
Talk Title: Graph Laplacian Regularizer for Inverse Imaging Problems
Abstract: An inverse imaging problem is inherently an ill posed problem, and as such, appropriate definitions of image priors are crucial to regularize the problem into a well posed one. In this talk, by viewing an image patch as a graphs-signal, I describe how a graph Laplacian regularizer can be defined as a signal prior for inverse imaging problems. First, by interpreting observed graph-signals probabilistically, we show that the graph Laplacian captures the inter-pixel correlations, and the corresponding graph Fourier transform can decorrelate a graph-signal and approximate the KLT. We design a piecewise smooth image denoising algorithm based on this observation and show performance gain over state-of-the-art BM3D. Second, we show how by interpreting a graph-signal alternatively as random samples on a continuous manifold, the graph Laplacian regularizer converges to a continuous functional under mild conditions. We then show how by selecting feature functions that define the continuous gradient operator carefully, the corresponding discrete graph Laplacian regularizer is then discriminant. Based on this observation, we design a regular image denoising algorithm and bit-depth enhancement algorithm and demonstrate their merits in their respective applications.
Biography: Gene Cheung received the B.S. degree in electrical engineering from Cornell University in 1995, and the M.S. and Ph.D. degrees in electrical engineering and computer science from the University of California, Berkeley, in 1998 and 2000, respectively.
He was a senior researcher in Hewlett-Packard Laboratories Japan, Tokyo, from 2000 till 2009. He is now an associate professor in National Institute of Informatics in Tokyo, Japan.
His research interests include 3D visual representation and immersive communication. He has published over 120 international conference and ournal publications. He has served as associate editor for IEEE Transactions on Multimedia from 2007 to 2011 and currently serves as associate editor for DSP Applications Column in IEEE Signal Processing Magazine and APSIPA journal on signal & information processing, and as areaeditor for EURASIP Signal Processing: Image Communication. He currently serves as member of the Multimedia Signal Processing Technical Committee (MMSP-TC) in IEEE Signal Processing Society (2012-2014). He has also served as area chair in IEEE International Conference on Image Processing (ICIP) 2010, 2012-2013, technical program co-chair of International Packet Video Workshop (PV) 2010, track co-chair for Multimedia Signal Processing track in IEEE International Conference on Multimedia and Expo (ICME) 2011, symposium co-chair for CSSMA Symposium in IEEE GLOBECOM 2012, and area chair for ICME 2013. He was invited as plenary speaker for IEEE International Workshop on Multimedia Signal Processing (MMSP) 2013 on the topic "3D visual communication: media representation, transport and rendering'". He is a co-author of best student paper award in IEEE Workshop on Streaming and Media Communications 2011 (in conjunction with ICME 2011), best paper finalists in ICME 2011 and ICIP 2011, best paper runner-up award in ICME 2012, and best student paper award in ICIP 2013.
Host: Prof. Antonio Ortega
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Talyia Veal
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Towards Computer-Aided Design of Electrical Energy Systems: Challenges and Solutions
Fri, Aug 22, 2014 @ 10:30 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Massimo Poncino, Politecnico di Torino
Talk Title: Towards Computer-Aided Design of Electrical Energy Systems: Challenges and Solutions
Abstract: Electrical energy systems (EESs) include energy generation, distribution, storage, and consumption, and involve many diverse components and sub-systems to implement these tasks. In this talk we discuss fundamental concepts towards a first attempt in applying EDA design methodologies that are widely used for electronics systems design to the case of the design of EESs. CAD for EESs encompasses modeling, simulation, design and optimization and is a challenging task that mandates a multidisciplinary and heterogeneous approach. We identify similarities and differences between electrical energy systems and electronics systems in order to inherit as much as possible the profound legacy resources of EDA. The talk analyzes in deeper details the issue of representation, modeling, and simulation of EESs, tasks that naturally precede synthesis and optimization in a typical design flow. We will first introduce a modeling and simulation environment based on standard and open tools and formalisms, namely SystemC/AMS and IP-XACT; we formally define the model interfaces for EES components by extending the IP-XACT standard; this allows (1) to define abstract âmeta-modelsâ for these components with which a model must comply, and (2) using the power configuration information contained in the IP-XACT descriptions, to seamlessly plug such components into the SystemC simulation framework. Our approach allows therefore designers of EESs to implement multi-level simulations, where different components can be simulated at different levels of details, while using a single, open simulation platform. We compare the proposed methodology against traditional model-based approaches the use Matlab/Simulink and show how our approach can be more efficient, more flexible, and more extensible. The talk also describes an automated modeling methodology that allows to semi-automatically derive models for batteries directly and solely from the information available in datasheets; the tools leverages the actually available data and generates a model whose level of accuracy matches the amount of information in the datasheet. This approach can also be used in the opposite way, that is, as a way to define standardized levels of accuracy for the models by identifying which information are required to achieve a given degree of accuracy.
Biography: Massimo Poncino is Full Professor of Computing Systems at Politecnico di Torino. Prior to that, he was an Associate Professor (from 2004 to 2006) at Politecnico di Torino, Associate Professor (from 2001 to 2004) at Università di Verona, and Assistant Professor (from 1995 to 2001) at Politecnico di Torino. From 1993 to 1994 he was a Visiting Scientist at the Dept of Electrical and Computer Engineering of the Univ. of Colorado, Boulder, USA. He holds a Dr. Eng. degree in EE (1989) and a PhD degree in Computer Eng., both from Politecnico di Torino (1993). His research interests include the design automation of digital systems, with emphasis on low-power embedded systems, modeling and the simulation of systems-on-chip, and automatic synthesis of digital systems. He has coauthored more than 300 publications in the above areas. He served as member of Technical Program Committee of more than 50 IEEE and ACM conferences, was the Technical Program Chair of the 2011 IEEE/ACM Symposium on Low-Power Electronics and Design and General co-Chair for the same conference in 2012. He has served in the Editorial Board of the IEEE Transactions on CAD from 2006 to 2011, and is currently serving in the Editorial Board of IEEE Design & Test and ACM Transactions on Design Automation of Electronic Systems (TODAES). Prof. Poncino is a Senior Member of IEEE, member of the ACM SIGDA Low-Power Technical Committee, and a Member the Circuit and Systems Society.
Host: Massoud Pedram
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Annie Yu
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
